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Mulch and irrigation effects on plant water relations and performance of cassava manihot esculenta u cultivar tms 88 30001 and sweet potato ipomoea batatas



Mulch and irrigation effects on plant water relations and performance of cassava manihot esculenta u cultivar tms 88 30001 and sweet potato ipomoea batatas



Field Crops Research 7(1): 13-30



Mulch and irrigation effects on plant-water relations and performance of cassava cv. TMS 30001 and swweet potato cv. TIS 2148 and TIS 2295 were investigated at Ibadan, Nigeria. Straw mulch (6 t[ton]/ha) was spread immediately after planting of crops in Sept. 1980. Irrigation equal to pan evaporation was applied during the dry season of 1980/1981. Unmulched and/or nonirrigated plants of both crops had lower leaf water potential than mulched and/or irrigated. Averaged over all the treatments and cultivars, cassava had 15.00 h leaf water potential of -3.6 bars as compared to -9.6 bars of sweet potato. The daytime leaf diffusion resistance of cassava was similar (2-5 s/cm) in unirrigated mulched and irrigated mulched and unmulched plots. But in unirrigated unmulched plots, the resistance increased to 19 s/cm at 15.00 h. Mulching did not affect leaf diffusion resistance (2-8 s/cm) of both cultivars of sweet potato in irrigated plots. But in nonirrigated plots, leaf resistance increased with time during the day; the increase was less in mulched (from 2-40 s/cm in TIS 2148 and 3-13 s/cm in TIS 2295) than in unmulched (from 3-54 s/cm in TIS 2148 and 2-20 s/cm in TIS 2295) treatments. At harvest, the yields of cassava and sweet potato were not significantly affected by mulching. Cassava yield was significantly greater in irrigated (24.7 t/ha) than in nonirrigated plots (18.2 t/ha). Irrigated sweet potato (at 8.5 t/ha of TIS 2148 and 8.7 t/ha of TIS 2295) outyielded the nonirrigated (at 5 t/ha of TIS 2148 and 2.8 t/ha of TIS 2295) one.

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